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[Y-specific sequences in Turner syndrome].

R Slezak1, M Sasiadek, T Dobosz

  • 1Zakładu Genetyki Katedry Patofizjologii AM we Wrocławiu.

Ginekologia Polska
|October 27, 1999
PubMed
Summary

Turner Syndrome (TS) is a monosomy where some fetuses are mosaics with Y chromosomes. Detecting Y-specific sequences in TS patients is crucial for identifying risks and guiding diagnosis.

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Area of Science:

  • Genetics
  • Human Genetics
  • Reproductive Biology

Context:

  • Turner Syndrome (TS) is a monosomy affecting human development, with high fetal abortion rates.
  • Mosaic karyotypes, particularly those involving Y chromosome material (mar(Y)), occur in 2-11% of TS patients.
  • The presence of Y-specific sequences in mosaic TS is linked to an increased risk of gonadoblastoma, necessitating gonadectomy in some cases.

Purpose:

  • To detect subtle mosaicism, specifically identifying marker Y chromosomes (mar(Y)), in Turner Syndrome patients.
  • To utilize Polymerase Chain Reaction (PCR) and Fluorescence In Situ Hybridization (FISH) for sensitive detection of Y-specific sequences.
  • To evaluate the clinical utility of searching for Y sequences in routine TS genetic diagnostics.

Summary:

  • This study employed PCR and FISH to detect Y-specific sequences in Turner Syndrome patients, identifying mosaicism in 7% of cases.
  • Positive amplification of Y-specific sequences was observed in a subset of TS patients, indicating the presence of Y chromosome material.
  • The findings support the integration of Y-sequence detection into standard genetic diagnostics for Turner Syndrome.

Impact:

  • Establishes the effectiveness of PCR and FISH in identifying Y chromosome mosaicism in Turner Syndrome.
  • Highlights the importance of detecting Y-specific sequences for risk assessment of gonadoblastoma in TS patients.
  • Recommends the routine inclusion of Y-sequence analysis in the genetic diagnosis of Turner Syndrome for improved patient management.

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